Between Daniel 9:25 and Daniel 9:26a - yes, it is the same person. Same strong's number, 4899.
But in Daniel 9:26b, differently, it is 5057, for the prince who shall come.
9:25 Know 3045 8799 therefore and understand 7919 8686, [that] from the going forth 4161 of the commandment 1697 to restore 7725 8687 and to build 1129 8800 Jerusalem 3389 unto the Messiah 4899 the Prince 5057 [shall be] seven 7651 weeks 7620, and threescore 8346 and two 8147 weeks 7620: the street 7339 shall be built 1129 8738 again 7725 8799, and the wall 2742, even in troublous 6695 times 6256.(be built…: Heb. return and be built)(wall: or, breach, or, ditch)(troublous: Heb. strait of)
9:26 And after 310 threescore 8346 and two 8147 weeks 7620 shall Messiah 4899 be cut off 3772 8735, but not for himself: and the people 5971 of the prince 5057 that shall come 935 8802 shall destroy 7843 8686 the city 5892 and the sanctuary 6944; and the end 7093 thereof [shall be] with a flood 7858, and unto the end 7093 of the war 4421 desolations 8074 8802 are determined 2782 8737.(but…: or, and shall have nothing)(desolations…: or, it shall be cut off by desolations)
For 5057, it means...
Strong:
H5057
Orig: or nagid \i naw-gheed'\i0\plain\f3\fs21\cf23 ; from 5046; a commander (as occupying the front), civil, military or religious; generally (abstractly, plural), honorable themes:--captain, chief, excellent thing, (chief) governor, leader, noble, prince, (chief) ruler.
H5046
In Daniel 8:9, the little horn waxes great to the middle east and Israel.
My commentary is that basically, the little horn leader of Europe will head that direction with a strong army. And occupy the region following Gog/Magog on the premise of keeping peace and stability in the region.
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Again, it is not saying Antichrist in Daniel 9:26b because the person as the prince who shall come is not yet the Antichrist, but the little horn, King of the Roman Empire in the end times.